Soy can reduce levothyroxine absorption and raise your dose needs if eaten too close to the pill. The evidence on isoflavones, timing, and infant formula.
Soy and Levothyroxine: Does Soy Block Your Thyroid Medication? Read More »
PPIs like omeprazole reduce iron absorption by removing the stomach acid iron needs. If your iron isn’t budging, here’s the form, timing, and vitamin C fix.
Omeprazole and Iron: Why Your Supplement Isn’t Working (and the Fix) Read More »
A daily multivitamin with calcium, iron, or magnesium can block levothyroxine if taken together. Which minerals matter and how to time your Synthroid.
Can You Take a Multivitamin With Levothyroxine? Which Minerals Block It Read More »
Folic acid reduces methotrexate side effects without killing its benefit – but timing matters and folinic acid is different. The standard 1 mg/day protocol.
Folic Acid With Methotrexate: How Much and When to Take It Read More »
From supplements, yes – the supplemental UL is 350 mg, and the first sign is loose stools. When high magnesium becomes dangerous.
Can You Take Too Much Magnesium? Read More »
Oral contraceptives can lower serum zinc, which may show up as acne, lower immunity or mood changes. The evidence and how much zinc is reasonable to replace.
Does Birth Control Deplete Zinc? Skin, Immunity and Mood Read More »
Bottom line An iron-free prenatal is a reasonable choice if iron makes you nauseous or constipated and you dose iron separately, but it is not a way to dodge iron entirely. Seeking Health Optimal Prenatal is our top iron-free pick on nutrient coverage; Needed wins on choline and testing; Mama Bird is the budget one-a-day
Best Prenatal Vitamins Without Iron (For Sensitive Stomachs) Read More »
Test before you take iron. The best at-home iron and ferritin finger-prick kits compared, and how to use the number.
Best At-Home Iron & Ferritin Test (2026): Test Before You Take Iron Read More »
Usually fine for most people, but ashwagandha can mildly lower blood sugar, so it may add to metformin. Tell your prescriber, monitor glucose, watch for lows.
Yes – there is no known interaction between fish oil and metformin, and it does not worsen blood sugar. Take both with a meal. Watch the dose if over 2 to 4 g
